Clearly a flawed tyre.......email the euro Duc dealer and ask that they confirm the nature of the reason for changing the tyre for you i.e. confirm that the original tyre was faulty.
Provide a copy of their response and copy invoice for the new tyre to your Dealer and ask (insist!) that they make a Warranty claim via Duc UK ;-)
Ducati should be made aware of this.....there could be a batch of duff tyres out there! I would contact Pirelli also:
http://www.pirelli.com/tyres/en-gb/contact-us Might be worth posting here as well ;-)
http://www.ducatiforum.co.uk/forums/multistrada.6/